Tests

Fix isinstance with unions of tuples (#20677) #20480

Job	Run time
Test mypyc suite with 32-bit Python	9m 13s
Test suite with py313-ubuntu, mypyc-compiled	14m 4s
Test suite with py314-ubuntu, mypyc-compiled	14m 13s
Test suite with py311-ubuntu	9m 6s
Test suite with py310-ubuntu, mypyc-compiled	15m 24s
Test suite with py314t-ubuntu, mypyc-compiled	17m 9s
Test suite with py314-windows-64	26m 23s
mypyc runtime tests with py310-ubuntu	5m 24s
Formatting and code style with Black + ruff	1m 54s
Parallel tests with py314-ubuntu, interpreted	26m 45s
Type check our own code (py310-ubuntu)	1m 37s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 7s
mypyc runtime tests with py313-macos	5m 45s
Type check our own code (py310-windows-64)	3m 10s
Test suite with py312-ubuntu	8m 55s
	3h 8m 9s

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